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题名: More evidence for the red-shift dependence of colour from the Joint Light-curve Analysis supernova sample using red-shift tomography
作者: Li, M ;  Li, N ;  Wang, S ;  Zhou, LJ
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2016
卷号: 460, 期号:3, 页码:2586-2592
关键词: supernovae general ;  cosmological parameters ;  cosmology: observations ;  dark energy
学科分类: Astronomy & Astrophysics
DOI: http://dx.doi.org/10.1093/mnras/stw1063
通讯作者: Li, M (reprint author), Sun Yat Sen Univ, Sch Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China.
文章类型: Article
英文摘要: In this work, by applying the red-shift tomography method to the Joint Light-curve Analysis (JLA) supernova sample, we explore the possible red-shift dependence of the stretch luminosity alpha and the colour luminosity beta. The basic idea is to divide the JLA sample into different red-shift bins, assuming that alpha and beta are piecewise constants. Then, by constraining the I > CDM model, we check the consistency of the cosmology-fitting results given by the supernova sample of each red-shift bin. We also adopt the same technique to explore the possible evolution of beta in various subsamples of JLA. Using the full JLA data, we find that alpha is always consistent with a constant value. In contrast, at high red shift, beta has a significant trend of decreasing, at similar to 3.5 sigma confidence level (CL). Moreover, we find that the low-z subsample favours a constant beta; in contrast, the Sloan Digital Sky Survey and Supernova Legacy Survey subsamples favour a decreasing beta at 2 sigma and 3.3 sigma CL, respectively. Besides, by using a binned parametrization of beta, we study the impact of the evolution of beta on parameter estimation. We find that compared with a constant beta, a varying beta yields a larger best-fitting value of fractional matter density Omega(m0), which slightly deviates from the best-fitting result given by other cosmological observations. However, for both the varying beta and the constant beta cases, the 1 sigma regions of Omega(m0) are still consistent with the result given by other observations.
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: IMPROVED COSMOLOGICAL CONSTRAINTS ;  DARK-ENERGY CONSTRAINTS ;  IA SUPERNOVAE ;  ACCELERATING UNIVERSE ;  LEGACY SURVEY ;  DATA RELEASE ;  MODEL ;  GALAXIES ;  PARAMETERS ;  PHOTOMETRY
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11275247, 11335012, 11405024] ;  Sun Yat-Sen University [985] ;  Fundamental Research Funds for the Central Universities [16lgpy50]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21560
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Li, M,Li, N,Wang, S,et al. More evidence for the red-shift dependence of colour from the Joint Light-curve Analysis supernova sample using red-shift tomography[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(3):2586-2592.
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